Normaly apartment contract is for two years.
So called monthly apartments are normaly rented for single month basis
and are furnished. The rent is rather higher.
Shikikin
Refundable deposit
Reikin
Non Refundable money. Key Money.
Chukai Tesuryou
Commision to be paid to real estate agent.
Normaly equivalent to one month rent.
Hoshonin
A guarantor.
Furniture
Not too many apartments are furnished in Japan, unless it indicated.